$(document).ready(function(){
	var loanTool = {
	    /**
	     * 计算并返回月还款本息的方法
	     * @param loanAmount            贷款本金(也就是贷了多少款，比如，70万)
	     * @param months                还款月数(也就是贷款周期，如20年，则此处为240个月)
	     * @param annualInterestRate    年利率(比如，6.55%，则此处传入为6.55,应除以100以后转为0.0665再进行计算)
	     */
	    getPaymetnsPerMonth: function (loanAmount, months, annualInterestRate) {
	        // 等额本息还款法计算公式：
	        // -- 月还款本息=〔贷款本金×月利率×（1＋月利率）＾还款月数〕÷〔（1＋月利率）＾还款月数－1〕
	        // -- 月利率=年利率÷12=0.0665÷12=0.005541667
	        // -- 其中＾符号表示乘方
	        var rateOfMonth = annualInterestRate / (12 * 100);
	        // 将计算所得的月还款金额(本息)返回
	        return (loanAmount * rateOfMonth * Math.pow((1 + rateOfMonth), months)) / (Math.pow((1 + rateOfMonth), months) - 1);
	    }
	};
	//选项卡切换
	$(function () {
	    $("#tabs .title").find("li").each(function (index) {
	        $(this).on("click", function () {
	            $(this).siblings().find("a").removeClass("current");
	            $(this).find("a").addClass("current");
	
	            $("#content>div").eq(index).fadeIn().siblings().stop().hide();
	        });
	    });
	
	    //计算方式
	    $("#way input[type=radio]").on("change", function () {
	        $(this).parents("dt").next().slideDown().siblings("dd").slideUp();
	    });
	
	    // 贷款利率----------------------------------------------------------------
	    var loanRate = [
	        ["6.80", "6.55", "6.15", "5.90"],
	        ["4.70", "4.50", "4.25", "4.00"]
	    ];
	
	    function Interest() {
	        var row = $("#myform input[name=dktype]:checked").val();
	        var col = $("#myform select[name=dkll]").val();
	        $("#myform input[name=dkll]").val(loanRate[row][col]);
	    }
	
	    Interest();
	    $("#myform input[name=dktype]").on("change", function () {
	        Interest();
	    });
	    $("#myform select[name=dkll]").on("change", function () {
	        Interest();
	    });
	    /**
	     *
	     */
	    $("#myform input[name=jsfs]").on("change", function () {
	        $(this).parent().next().slideDown();
	        $(this).parent().siblings("dt").next().hide();
	    });
	
	    $("#myform input[name=startCalc]").on("click", function () {
	        var calcMode = $("#myform input[name=jsfs]:checked").val();
	
	        switch (calcMode) {
	            case "0":
	
	                showLoanInfo(calcByAreaAndPrice());
	                break;
	            case "1":
	                showLoanInfo(calcByLoanTotal());
	                break;
	        }
	    });
	    function calcByAreaAndPrice() {
	        var loanInfo = {};
	
	        var houseMoneyTotal = parseFloat($("#myform input[name=price]").val()) * parseFloat($("#myform input[name=area]").val());
	
	        loanInfo.houseMoneyTotal = houseMoneyTotal;
	
	        var ajcs = $("#myform select[name=ajcs]").val();
	        var loanTotal = houseMoneyTotal * (parseInt(ajcs) / 100);
	        loanInfo.loanTotal = loanTotal;
	        loanInfo.initialPayment = houseMoneyTotal - loanTotal;
	
	        var repaymentMonths = $("#myform select[name=ajns]").val();
	        loanInfo.repaymentMonths = repaymentMonths;
	
	        var interestRate = $("#myform input[name=dkll]").val();
	        var repaymentPerMonth = loanTool.getPaymetnsPerMonth(loanTotal, repaymentMonths, interestRate);
	        loanInfo.repaymentPerMonth = repaymentPerMonth;
	
	        loanInfo.repaymentTotal = repaymentPerMonth * repaymentMonths;
	
	        loanInfo.interestTotal = loanInfo.repaymentTotal - loanInfo.loanTotal;
	
	        return loanInfo;
	    }
	
	    // 根据贷款总额计算贷款数据
	    function calcByLoanTotal() {
	        var loanInfo = {};
	
	        // 计算房款总额：略
	        loanInfo.houseMoneyTotal = "略";
	
	        // 计算贷款总额
	        var loanTotal = parseFloat($("#myform input[name=dkze]").val());
	        loanInfo.loanTotal = loanTotal;
	
	        // 计算首期付款：无
	        loanInfo.initialPayment = 0;
	
	        // 计算贷款月数：
	        var repaymentMonths = $("#myform select[name=ajns]").val();
	        loanInfo.repaymentMonths = repaymentMonths;
	
	        // 计算月均还款额
	        var interestRate = $("#myform input[name=dkll]").val();
	        var repaymentPerMonth = loanTool.getPaymetnsPerMonth(loanTotal, repaymentMonths, interestRate);
	        loanInfo.repaymentPerMonth = repaymentPerMonth;
	
	        // 计算还款总额：月均还款额 * 贷款月数
	        loanInfo.repaymentTotal = repaymentPerMonth * repaymentMonths;
	
	        // 计算支付利息：还款总额 - 贷款总额
	        loanInfo.interestTotal = loanInfo.repaymentTotal - loanInfo.loanTotal;
	
	        return loanInfo;
	    }
	
	    // 显示最终贷款信息
	    function showLoanInfo(loanInfo) {
	        $("#myform input[name=fousex]").val(loanInfo.houseMoneyTotal)
	        $("#myform input[name=loan]").val(loanInfo.loanTotal.toFixed(2))
	        $("#myform input[name=refund]").val(loanInfo.repaymentTotal.toFixed(2))
	        $("#myform input[name=pay]").val(loanInfo.interestTotal.toFixed(2))
	        $("#myform input[name=first]").val(loanInfo.initialPayment.toFixed(2))
	        $("#myform input[name=month]").val(loanInfo.repaymentMonths)
	        $("#myform input[name=average]").val(loanInfo.repaymentPerMonth.toFixed(2))
	    }
	});
});